201142463 六、發明說明： 【發明所屬之技術領域】 正之圖像之投影機及 本發明係關於一種可投射經梯形修 由該投影機而進行之圓像投射方法。 【先前技術】 作為投影機’眾所周知有為了減少由傾斜投射所引起之 圖像之變形，而藉由在圖像形成面板之圖像顯示區域之一 部分形成㈣而修正顯示圖像之梯形變形者，尤其於手動 調整型之投影機中，梯形變形之修正量即梯形修正量於動 作之停止時被保存，於下—次之起動時讀出該梯形修正量 進仃如以刚般之梯形修正。於如此之投影機中，若於停止 前進行極端的梯形修正，則即便於直至下一次起動為止之 期間投影機之姿勢等變化較大之情形時，容易使其後之起 動時用以使梯形修正量適當之操作次數增加且操作繁瑣。 作為使如上述般之手動調整型之投影機之功能提高者，存 在檢測投影機之設置角度並根據其設置角度而自動地實施 梯形修正者（參照專利文獻丨）。又，亦存在藉由檢測用圖案 之投射及檢測可進行梯形變形之自動的修正，且於梯形修 正時，將變焦等之調整並行進行者（參照專利文獻2、3)。 [先行技術文獻] [專利文獻] [專利文獻1]曰本專利特開2003-283963號公報 [專利文獻2]曰本專利特開2006-5 534號公報 [專利文獻3]日本專利特開2000-241874號公報 153456.doc 201142463 【發明内容】 [發明所欲解決之問題] 然而’如上述專利文獻1般之投影機中，需要謂之角度 感測器之設置角度檢測裝置，從而裝置複雜化且成本增 加。 又，如上述專利文獻2、3般之投影機中，亦需要檢測用 圖案之投射或檢測用圖案之檢測裝置，從而裝置複雜化且 成本增加。 因此’本發明之目的在於提供—種可藉由抑制成本增加 之簡易的構造而提高梯形修正之調整之作業性之投影機及 由其而進行之圖像投射方法。 [解決問題之技術手段] 為了解決上述課題，本發明之投影機包括：影像投射 部，其投射圖像；梯形修正部，其對投射至影像投射部上 之圓像實施梯形修正；非揮發性之記憶部，其記憶投影機 之，止時及信號處理之變更時的至少一者之前的前梯形修 正置、與跟該前梯形修正量相關之特定之容許值；及調整 部，其於前梯形修正量超過特定之容許值之情形時，於上 述：影機之起動後或者信號處理之變更後，將梯形修正部 之形修正里设定為特定之標準值及零之任一者。 ，據上述投影機’由於調整部於前梯形修正量超過特定 =許值之情料，於投影機之起動後或者信 ::任::形修正部之梯形修正量設定為特定之標準值及 因此可減少用以使梯形修正量適當之操作次 153456.doc 201142463 數並使梯形修正之調整作業有效者n進行極端的梯 形修正之情形為前提，即便於直至下—起動後或信號處理 之變更後為止之期間投影機之姿勢比較大地變化亦可使 對應其之梯形修正量之調整作業相對簡單化。 本發明之具體的態樣中，於上述投影機中，進而包括用 以變更影像投射部之信號處理之操作部，謂由操作部而 進行之信號處理之變更係輸人信號之㈣、動作模式之變 更、縱橫比之變更中至少一者。於該等情形時，亦存在梯 形修正量之變更較理想之情形時，可使伴隨如此之信號處 理之變更之梯形修正之調整作業簡易化。 本發明之另―態樣中，特定之容許值依輸人信號之種類 而不同必匕處’特定之容許值成為是否於起動後等時維持 前梯形修正量之基準，例如，藉由輸人信號之種類而解像 度之要求級不同，因此特定之容許值亦對應解像度之要求 級亦即輸入信號之種類等而設定較為理想。 本發明之又-態樣中，調整部於投影機之起動後及信號 處理之變更後之至少一者時，使梯形修正部之梯形修正量 朝向特定之標準值或者零而階段性地變化。於該情形時， 由於可視覺性地理解不使之為以前之狀態所對應之前梯形 修正量而返回至特定之標準值或者零的㈣，因此使用者 可明確地把握投影機之狀態。#者，於^回至特定之標準 值或者零之過程中，藉由使用者強制性地中斷該返回動 作’亦可達成適當的梯形修正量。 本發明之又一態樣中，調整部於投影機之起動後及信號 153456.doc 201142463 處理之變更後之至少一 者時，於前梯形修正量超過特定t 容許值之情形時，可選擇是否將梯形 使用者之判斷，將梯形修正部之梯形利用 ^^ ,β % ^ ^ °丨之梯形修正量迅速返回至特 疋之軚準值或者零之中更佳的狀態。 本發明之又一態樣中，調整部：投影機之起動後及信號 處理之變更後之至少一者時， ’ 、_ ^ π珂梯形修正量超過特定之 容許值之情料，可選擇使梯形修正部之梯形修正量維持 “梯形修正量。於該情形時’可迅速對付投影機之姿勢 等之狀況直至下—次之起動為止之期間不變化之情形。 本發明之又-態樣中，調整部於投影機之起動後及信號 處理之變更後之至少-者時，於前梯形修正量為下側之梯 形=正之情形時，禁止將梯形修正部之梯形修正量設定為 特疋之^準值及零之任一者。於前梯形修正量為下側之梯 形修正之情形時’認為設置之狀況特殊，考慮存在不僅強 制性地解除梯形修正反而損及使用情況之可能性。 本發明之圖像投射方法係包括投射圖像之影像投射部之 投影機之圖像投射方法，且判斷投影機之停止時及信號處 理之變更時之至少一者之前的前梯形修正量是否超過與該 前梯形修正量相關之特定之容許值，於上述前梯形修正量 超過上述容許值之情形時，於投影機之起動後或者信號處 理之變更後’將梯形修正部之梯形修正量設定為特定之標 準值及零之任一者。 根據上述圖像投射方法，於前梯形修正量超過特定之容 153456.doc 201142463 許值之it形夺於起動後或者錢處理之變更後 修正部之梯形修正量設定為特定之標準值及零之任—Γ 因此可減少用以使梯形修正景、态 ^正$適當之操作次數並使梯形絛 正之調整作業有效者。 ^修 【實施方式】 [第1實施形態] 以下，參照圖1〜3，甜太版i Μ 發月之第1實施形態之投影機 行說明。 [Α.投影機之構造] 如圖UA)所示’作為投影機1Q之本體⑽，包括控制部 11、記憶部12、鍵輸人處理部13、㉟人選擇部、圖像處 理部15、影像投射部17、通訊部18、及電源部。 控制部11控制投影㈣之功能全體。即，控制部㈣記 憶部12、鍵輸入處理部13、㉟入選擇部14、圖像處理部 15、通訊部18、電源部22等能夠通訊地連接’自該等之部 刀中取人資afl ’或者對該等之部分發送控制信號等而控制 動作狀態。控制部u尤其作為與梯形修正相關之調整部 ug之功能，包含修正量對比部lla、修正維持部ub、修 幻艮制部llc、切換判定部lld、及修正量保存控制部⑴ 等。關於料功能之詳細情況將於下文敍述。再者，如圖 1(B)所示’即便藉由投影機1〇而投射至螢幕％上之圖像1^ 係原本具有矩形之輪郭者，亦存在因投射方向等之主要原 因而梯形地變形並投射之情形。為了防止如此之梯形變 形，而藉由圖像處理即梯形修正，預先相反地形成變形之 153456.doc 201142463 影像，由此如圖1(C)所示，投射至螢幕sc上之圖像13^，成 為具有矩形之輪郭者。 §己憶部12由R〇M(Read Only Memory，唯讀記憒 體）12a、RAM(Rand〇m Access Memory，隨機存取記憶 體）12b非揮發性§己憶體丨2C等而構成，且保持使投影機 1〇動作所需要之程式、資料[尤其，非揮發性記憶體 12c 由 EEPR〇M(Electrically Erasable Pr〇grammaMe 以以 〇nly Memory’電子可擦可程式化唯讀記憶體）等而構成， 可覆寫地保持於該非揮發性記憶體12c中之資料中，包含 例如藉由圖像處理部15之梯形修正部15a而進行之梯形^ 相關之資訊，具體而s為動作狀態變化前之梯形修正量 7即前梯形修正量）、與該前梯形修正量之維持相關之特 定之容許值等。又，非揮發性記憶體12。中可覆寫地保持 有當前時間點之輸入信號之種類、動作模式、縱橫比等即 信號處理狀態相關之各種資訊。此處，所謂輸入信號之種 類’係指成為投射之對象之信號為來自電腦之圖像信號、 來自數碼音樂播放器之視訊信號等之任一者。所謂動作模 式，係指投射圖像之解像度之各種設定、對應螢幕之類型 而準備之各種投射模式等H縱橫比，係指4 3、16 9之 畫面之縱料。Μ，記憶和中亦保持有應由影像投射 部17投射之投射圖像所對應之圖像資料。該圖像資料中包 含用以變更輸人信號或動作模式之菜單畫面、用以輸入使 用者之指示之對話畫面等相關者。再者，f己憶部Η中除了 可保存投影機1〇當初所保有之圖像資料以外，還可追加地 153456.doc 201142463 保存經由通訊部18、輸入選擇部14等而自外部取入之圖像 資料或者圖像信號。 鍵輸入處理部13係用以輸入使用者之指示之輸入單元或 者操作部，具有包含一組操作鍵之鍵操作部28。鍵輸入處 理部丨3中亦可附隨作為UI(User Interface，使用者介面）之 顯不器。附隨於鍵輸入處理部13設置有遙控受光部25，且 可自遙控26無線且遠程地接收指令信號。 再者，如圖2所例示般，鍵操作部28中，作為一組操作 鍵以適當之排列設置有電源按鈕28a、輸入切換按鈕28b、 菜單按紐28c、脫逸按紐28d、表示4個方向之三角按紐 29a ' 29b、29c、29d、確定按鈕29e、2個梯形修正按鈕 29f、29g、變焦按鈕29h等。該等按鈕28a、28b、28c、 28d、29a、29b、29c、29d、29e、29f、29g、29h亦即一組 操作鍵，不僅設置於鍵操作部28中，而且亦設置於遙控26 中。構成鍵操作部28之2個梯形修正按紐29f、29g之中， 第1梯形修正按鈕29f係用以使投射像轉移至上側之梯形修 正並加強上側之梯形修正者，且係於使投影機1〇為正立狀 態而於較之投射鏡頭之光軸更靠上側進行圖像投射之情形 時’為了抑制圖像於上側相對性地擴大之現象（例如參照 圖1(B))而利用。又’第2梯形修正按鈕29g係用以使投射像 轉移至下側之梯形修正並加強下側之梯形修正者，且係於 使投影機10為正立狀態而於較之投射鏡頭之光軸更靠下側 進行圖像投射之情形時，為了抑制圖像於下側相對性地擴 大之現象而利用。 153456.doc -11 - 201142463 輸入選擇部14連接於連接器41。連接器41上可同時連接 有電腦、光碟唱機及其他複數個圖像輸出裝置（未圖示 輸入選擇部14係於控制部丨〗之控制下而動作，且自連接於 連接器上之複數個圖像輸出裝置之任—者接收輸入信號 (亦即圖像信號）並輸出至圖像處理部丨5。 圖像處理部15可對經由輸入選擇部14或者通訊部18而自 外部所輸入之圖像信號或者圖像資料進行包含諧調修正、 色修正、梯形修正、倍率修正、縱橫比之設定等之各種修 正處理。該等諧調修正、色修正、梯形修正、倍率修正等 之内容能夠於控制部11之控制下而變更，使用者可藉由利 用鍵輸入處理部1 3而切換圖像處理部丨5之圖像處理狀態切 換，且可適當調節諧調修正、色修正、梯形修正、倍率修 正、縱橫比等之設定内容。尤其’藉由梯形修正部i5a而 將與輸入信號對應之圖像座標轉換等，由此圖像處理部15 可僅於影像投射部17之液晶面板之一部分（梯形區域）形成 圖像，可最終修正投射至螢幕上之圖像之梯形變形。如此 之梯形修正之程度亦即梯形修正量可藉由鍵操作部28之梯 形修正按鈕29f、29g之操作而增減調整，從而能夠將大致 矩形之圖像投射至螢幕上。具體而言，如圖1(B)所示具有 梯形變形之圖像IM如圖1(C)所示，藉由梯形修正按鈕29f 之操作而經過逐漸減少了變形之中間階段之圖像Σ M v而修 正為具有矩形之輪郭的圖像IM，。梯形修正量之增減調整 時之圖像處理係藉由使圖像IM之上下邊之倍率比變化而進 行。具體而言，將梯形修正之上下邊之倍率差之程度分為 153456.doc -12- 201142463 100¾ &，於使無梯形修正之矩形狀態為零級之情形 於為+50時上邊最縮小，於為·5()時下邊最縮小。於該情形 時，梯形修正量最大能夠設定為士50級。另外，圖像I ㈣可根據控制部!】之指令，生成包含自記憶部12取出之 文子資Λ等之菜單晝面及其他資訊顯示用之圖像信號。 影像投射部17具有液晶面板驅動部17a，該液晶面板驅 動部17a根據自圖像處理部15所輸出之圖像處理後之圖像 信號而驅動RGB之各色用之液晶面板。具體性的說明將省 略，影像投射部17作為光學系統，包括例如照明裝置、各 色用之液晶面板、合成棱鏡、投射鏡頭等，且將透過包含 液晶面板之各色用之液晶光閥之光合成並投射，由此於螢 幕（不圖示）上顯示彩色圖像。此處，照明裝置中附隨有使 作為光源之燈於所期望之狀態下點亮之燈驅動電路丨7c， s亥燈驅動電路17c係於控制部11之控制下而動作》再者， 影像投射部1 7之光學系統不限於液晶方式，可使用數位微 鏡裝置方式、LCOS(Liquid crystal on silicon，石夕上液晶） 方式等各種方式。又，上述實施形態中，例示有使用燈作 為光源進行投射之投影機1〇，但是本發明亦可適用於使用 LED(Light Emitting Diode，發光二極體）光源或雷射光源 等作為光源進行投射之投影機。 通訊部18係能夠通訊之介面電路。通訊部18可為能夠進 行例如無線LAN(local area network，區域網路）之特用模 式之通訊的無線型介面電路。 再者，電源部22係於控制部11之控制下而動作，且將電 153456.doc -13- 201142463 力供給至投影機ίο之各部中。 [B.投影機之動作] 以下’參照圖3等，對投影機10之投射動作之一例進行 說明。於由鍵輸入處理部1 3所檢測之指示信號要求起動之 情形時，投影機10之控制部11使以下將說明之處理開始。 具體而言，於投影機10之投射動作為停止狀態之情形時， 於使用者按下鍵操作部28之電源按鈕28a之情形時，使投 射圖像之顯示處理開始。 首先’控制部11執行藉由使影像投射部17之燈驅動電路 17c動作而點亮照明裝置之燈之順序，並且以與燈點亮相 對應之方式使圖像處理部15適當動作而使影像投射部”開 始圖像之投射（步驟sn)。此時，控制部丨丨參照記憶部12之 非揮發性記憶體l2c，使信號處理狀態恢復為熄滅之前之 狀態。具體而言’將輸入信號之種類、動作模式、縱橫比 等設定為媳滅之前之狀態’經由圖像處理部15等而使影像 投射部1 7開始圖像之投射。 然後，控制部11作為調整部丨lg 性記憶體12e中讀出前梯形修正量（步驟S12)。該前梯形修 正量成為相當於投影機1()停止時的之前之梯形修正量者。 進而’控制部⑽為調整部llg，自記憶部12之非揮發性 =㈣e中讀出容許值（步驟S13)e該容許值係與前梯形 持相關者，於前梯形修正量不大之情形時成為 L】::=!r判斷基準值，而言，於梯形修正 夠以為±5G級之情形時，容許值為設定例如士30 153456.doc •14- 201142463 級 再者，上述容許值係被寫入至記憶部12之非揮發性記憶 體12c中者，無需為j個，例如可根據輸入信號之種類而將 ^數個谷許值區分使用。具體而言，於輸入信號為來自電 腦者之情形時，使料值比較低，於輸人錢為來自光碟 曰機者之情形時，使容許值比較高。此係因為來自電腦之 圖像L號即便猶微犧牲變形亦可以高解像度進行投射之情 况較為理想’纟自光碟唱機之圖像信號即便稍微犧牲解像 又亦可以較少之變形進行投射之情況較為理想。實際之動 作中，控制部11作為調整部W 一面參照非揮發性記憶體201142463 VI. Description of the Invention: [Technical Field of the Invention] A projector for a positive image and the present invention relate to a method for projecting a circular image which can be projected by a trapezoidal lens. [Prior Art] As a projector, it is known that in order to reduce the deformation of an image caused by oblique projection, a trapezoidal deformer of a display image is corrected by forming (4) a portion of an image display region of the image forming panel. In particular, in the manual adjustment type projector, the correction amount of the trapezoidal deformation, that is, the trapezoidal correction amount is stored at the time of the stop of the operation, and the trapezoidal correction amount is read out at the start of the next to the next time, and is corrected in a trapezoidal manner. In such a projector, if the extreme trapezoidal correction is performed before the stop, even if the posture of the projector or the like changes greatly until the next start, it is easy to use the trapezoid for the subsequent start. The number of corrective operations is increased and the operation is cumbersome. As a function of improving the function of the projector of the manual adjustment type as described above, the trapezoidal correction is automatically performed by detecting the installation angle of the projector and automatically setting the angle according to the installation angle (see Patent Document). In addition, automatic correction of trapezoidal deformation is possible by projection and detection of the pattern for detection, and adjustment of zooming or the like is performed in parallel during trapezoidal correction (see Patent Documents 2 and 3). [Patent Document 1] [Patent Document 1] Japanese Laid-Open Patent Publication No. 2003-283963 (Patent Document 2) Japanese Patent Laid-Open Publication No. Hei No. 2006-5 534 [Patent Document 3] Japanese Patent Laid-Open No. 2000 [Problem to be Solved by the Invention] However, in the projector of the above-described Patent Document 1, the angle detecting device for the angle sensor is required, and the device is complicated. And the cost increases. Further, in the projectors of Patent Documents 2 and 3, a detecting device for detecting a pattern for projection or a pattern for detecting is required, and the device is complicated and costly. Therefore, the object of the present invention is to provide a projector capable of improving the workability of adjustment of trapezoidal correction by suppressing an increase in cost, and an image projection method therefor. [Means for Solving the Problems] In order to solve the above problems, a projector according to the present invention includes: a video projection unit that projects an image; and a trapezoidal correction unit that performs a trapezoidal correction on a circular image projected onto the image projection unit; a memory portion of the memory projector, a front trapezoidal correction before at least one of a stop time and a signal processing change, and a specific allowable value associated with the front trapezoidal correction amount; and an adjustment unit When the trapezoidal correction amount exceeds a specific allowable value, the shape correction of the trapezoidal correction unit is set to any one of a specific standard value and zero after the start of the camera or after the change of the signal processing. According to the above projector's situation, since the adjustment portion exceeds the specific value of the front trapezoidal correction value, the trapezoidal correction amount of the letter:::: shape correction unit is set to a specific standard value after the start of the projector or Therefore, it is possible to reduce the number of operation steps 153456.doc 201142463 for correcting the amount of trapezoidal correction, and to make the adjustment of the trapezoidal correction effective n to perform extreme trapezoidal correction, even after the start-up or the change of the signal processing. In the subsequent period, the posture of the projector is relatively large, and the adjustment operation corresponding to the trapezoidal correction amount can be relatively simplified. In a specific aspect of the present invention, the projector further includes an operation unit for changing signal processing of the image projection unit, wherein the signal processing by the operation unit is changed by a signal (four) and an operation mode. At least one of the change and the aspect ratio change. In such a case, when the change of the trapezoidal correction amount is ideal, the adjustment operation of the trapezoidal correction accompanying the change of the signal processing can be simplified. In another aspect of the present invention, the specific allowable value differs depending on the type of the input signal, and the specific allowable value is a criterion for maintaining the front trapezoidal correction amount after starting, for example, by inputting Since the type of the signal and the resolution level are different, the specific allowable value is preferably set corresponding to the required level of the resolution, that is, the type of the input signal. In still another aspect of the invention, the adjustment unit changes the trapezoidal correction amount of the trapezoidal correction unit to a specific standard value or zero stepwise after at least one of the start of the projector and the change of the signal processing. In this case, since it is visually understood that it is not returned to the specific standard value or zero (4) in the previous trapezoidal correction amount corresponding to the previous state, the user can clearly grasp the state of the projector. #者, The appropriate trapezoidal correction amount can also be achieved by the user forcibly interrupting the return action during the return to a specific standard value or zero. In still another aspect of the present invention, when the adjustment unit is at least one of after the start of the projector and after the change of the signal 153456.doc 201142463, when the front trapezoidal correction amount exceeds a specific t tolerance value, In the judgment of the trapezoidal user, the trapezoidal correction of the trapezoidal correction unit is quickly returned to the characteristic value of the characteristic or the better of the zeros by using the trapezoidal correction amount of ^^, β % ^ ^ °丨. In still another aspect of the present invention, the adjustment unit: after at least one of the start of the projector and the change of the signal processing, the ', _ ^ π 珂 trapezoidal correction amount exceeds a specific allowable value, and may be selected. The trapezoidal correction amount of the trapezoidal correction unit maintains the "trapezoidal correction amount. In this case, the situation of the posture of the projector can be quickly dealt with until the period from the next to the next start." When the adjustment unit is at least after the start of the projector and after the change of the signal processing, when the front trapezoidal correction amount is the trapezoidal = positive of the lower side, it is prohibited to set the trapezoidal correction amount of the trapezoid correction unit to be special. ^ Any one of the quasi-value and the zero. When the front trapezoidal correction amount is the trapezoidal correction of the lower side, the condition of the setting is considered to be special, and it is considered that there is a possibility that the trapezoidal correction is forcibly canceled and the use condition is impaired. The image projection method of the invention includes an image projection method of a projector that projects an image projection unit of an image, and determines at least one of a stop of the projector and a change of signal processing. Whether the front trapezoidal correction amount exceeds a specific allowable value associated with the front trapezoidal correction amount, and when the front trapezoidal correction amount exceeds the allowable value, the trapezoidal correction is performed after the start of the projector or after the signal processing is changed. The trapezoidal correction amount of the part is set to any one of the specific standard value and zero. According to the image projection method described above, the front trapezoidal correction amount exceeds the specific capacity 153456.doc 201142463 The value of the value is taken after the start or the money processing After the change, the trapezoidal correction amount of the correction unit is set to a specific standard value and zero - Γ Therefore, it is possible to reduce the number of operations for correcting the trapezoidal correction scene and the state and making the adjustment of the trapezoidal correction effective. [Embodiment] [First Embodiment] Hereinafter, a projector line according to a first embodiment of the present embodiment will be described with reference to Figs. 1 to 3. [Α. Structure of the projector] Fig. UA) The main body (10) of the projector 1Q includes a control unit 11, a storage unit 12, a key input processing unit 13, a person selection unit, an image processing unit 15, a video projection unit 17, a communication unit 18, and a power supply unit. control 11. The control unit (four) memory unit 12, the key input processing unit 13, 35, the selection unit 14, the image processing unit 15, the communication unit 18, the power supply unit 22, etc. are communicably connected to each other. The control unit u controls the operation state by transmitting a control signal or the like to the part of the knife. The control unit u functions as the adjustment unit ug related to the trapezoid correction, and includes the correction amount comparison unit 11a and the correction maintenance. The part ub, the magic correction unit, the switching determination unit 11d, the correction amount storage control unit (1), etc. The details of the material function will be described later. Furthermore, as shown in Fig. 1(B), The image that is projected onto the screen by the projector 1 is originally a rectangular wheel, and there is a case where the trapezoidal shape is deformed and projected due to the projection direction or the like. In order to prevent such trapezoidal deformation, the deformed 153456.doc 201142463 image is formed in advance by image processing, that is, trapezoidal correction, thereby projecting an image onto the screen sc as shown in FIG. 1(C). Become a person with a rectangular wheel. § The memory unit 12 is composed of R〇M (Read Only Memory) 12a, RAM (Rand〇m Access Memory) 12b, non-volatile § 己 丨 丨 2C, and the like. And keep the program and data necessary to operate the projector 1 [in particular, the non-volatile memory 12c is made of EEPR〇M (Electrically Erasable Pr〇grammaMe to 〇nly Memory' electronically erasable and programmable read-only memory) And constitutively held in the data in the non-volatile memory 12c, including information on the trapezoidal correlation performed by the trapezoidal correction unit 15a of the image processing unit 15, and specifically s is an operation state. The trapezoidal correction amount 7 before the change is the front trapezoidal correction amount), the specific allowable value related to the maintenance of the front trapezoidal correction amount, and the like. Also, non-volatile memory 12. The information related to the signal processing state, such as the type of the input signal at the current time point, the operation mode, and the aspect ratio, can be overwritten. Here, the term "input signal" means that the signal to be projected is any image signal from a computer, a video signal from a digital music player, or the like. The "operation mode" refers to the H aspect ratio of various settings such as the resolution of the projected image and various projection modes prepared for the type of the screen, and refers to the vertical material of the screen of 4 3 and 16 9 . The image data corresponding to the projected image to be projected by the image projecting portion 17 is also held in the memory and the memory. The image data includes a menu screen for changing an input signal or an operation mode, and a dialogue screen for inputting an instruction of the user. In addition, in addition to the image data that can be stored in the original projector, the 153456.doc 201142463 can be additionally stored and received from the outside via the communication unit 18, the input selection unit 14, and the like. Image data or image signal. The key input processing unit 13 is an input unit or an operation unit for inputting an instruction of the user, and has a key operation unit 28 including a set of operation keys. The key input processing unit 3 can also be accompanied by a UI (User Interface) display. The key input processing unit 13 is provided with a remote control light receiving unit 25, and the command signal can be wirelessly and remotely received from the remote control 26. Further, as illustrated in FIG. 2, the key operation unit 28 is provided with a power button 28a, an input switching button 28b, a menu button 28c, a escape button 28d, and four as a set of operation keys. The triangular buttons 29a' 29b, 29c, 29d, the OK button 29e, the two trapezoidal correction buttons 29f, 29g, the zoom button 29h, and the like. The buttons 28a, 28b, 28c, 28d, 29a, 29b, 29c, 29d, 29e, 29f, 29g, 29h, i.e., a set of operation keys, are provided not only in the key operating portion 28 but also in the remote control 26. Among the two trapezoidal correction buttons 29f and 29g constituting the key operation unit 28, the first trapezoidal correction button 29f is used to shift the projection image to the upper trapezoidal correction and to reinforce the upper trapezoidal corrector, and to make the projector When the image is projected on the upper side of the optical axis of the projection lens in the erect state, the image is used to suppress the image from being relatively enlarged on the upper side (see, for example, FIG. 1(B)). Further, the 'second trapezoidal correction button 29g is a trapezoidal correction for shifting the projection image to the lower side and enhancing the trapezoidal corrector of the lower side, and is for making the projector 10 erect, and is closer to the optical axis of the projection lens. When the image is projected on the lower side, it is used to suppress the phenomenon that the image is relatively enlarged on the lower side. 153456.doc -11 - 201142463 The input selection unit 14 is connected to the connector 41. The connector 41 can be connected to a computer, a disc player, and a plurality of other image output devices (the input selection unit 14 is not shown to be controlled by the control unit), and is connected to a plurality of connectors. Any one of the image output devices receives an input signal (i.e., an image signal) and outputs it to the image processing unit 丨 5. The image processing unit 15 can input the input from the outside via the input selection unit 14 or the communication unit 18. The image signal or image data includes various correction processing including harmonic correction, color correction, trapezoidal correction, magnification correction, and aspect ratio setting, etc. The contents of the harmonic correction, color correction, trapezoidal correction, and magnification correction can be controlled. By changing the control of the unit 11, the user can switch the image processing state switching of the image processing unit 丨5 by the key input processing unit 13, and can appropriately adjust the harmony correction, the color correction, the trapezoidal correction, and the magnification correction. The setting content of the aspect ratio, etc., in particular, the image coordinate unit corresponding to the input signal is converted by the trapezoidal correction unit i5a, and the image processing unit 15 can be used only for the image. One portion (trapezoidal area) of the liquid crystal panel of the projection portion 17 forms an image, and finally the trapezoidal deformation of the image projected onto the screen can be finally corrected. The degree of trapezoidal correction, that is, the trapezoidal correction amount can be trapezoidal by the key operation portion 28. Correcting the operation of the buttons 29f and 29g to increase or decrease the adjustment, so that a substantially rectangular image can be projected onto the screen. Specifically, the image 101 having a trapezoidal deformation as shown in FIG. 1(B) is as shown in FIG. 1(C). As shown in the figure, the image IM of the intermediate stage of the deformation is gradually reduced by the operation of the trapezoidal correction button 29f. The image of the trapezoidal correction amount is adjusted and adjusted. The processing is performed by changing the magnification ratio above and below the image IM. Specifically, the degree of the magnification difference above and below the trapezoidal correction is divided into 153456.doc -12- 201142463 1003⁄4 & The case where the corrected rectangular state is zero level is the smallest at the upper side when it is +50, and the lower side is the most narrow when it is ·5 (). In this case, the trapezoidal correction amount can be set to a maximum of 50. In addition, the image I (4) According to the control department!] The command generates an image signal for displaying the menu face and the like for displaying the text, etc., which are taken out from the memory unit 12. The image projection unit 17 includes a liquid crystal panel drive unit 17a, which is processed according to the image processing. The image signal after image processing output from the unit 15 drives the liquid crystal panel for each color of RGB. The specific description will be omitted, and the image projection unit 17 as an optical system includes, for example, an illumination device, a liquid crystal panel for each color, and a composite image. a prism, a projection lens, or the like, which combines and projects light passing through a liquid crystal light valve for each color of the liquid crystal panel, thereby displaying a color image on a screen (not shown). Here, the illumination device is accompanied by The lamp driving circuit 丨7c that illuminates the lamp of the light source in a desired state, and the s-light lamp driving circuit 17c operates under the control of the control unit 11. Furthermore, the optical system of the image projecting unit 17 is not limited to the liquid crystal mode. Various methods such as a digital micromirror device and a LCOS (Liquid Crystal on Silicon) method can be used. Further, in the above-described embodiment, a projector 1A that uses a lamp as a light source for projection is exemplified, but the present invention is also applicable to projection using a light source (LED) light source or a laser light source as a light source. The projector. The communication unit 18 is a interface circuit capable of communication. The communication unit 18 may be a wireless type interface circuit capable of performing communication in a special mode such as a wireless LAN (local area network). Further, the power supply unit 22 operates under the control of the control unit 11, and supplies power 153456.doc -13 - 201142463 to each unit of the projector ίο. [B. Operation of Projector] An example of the projection operation of the projector 10 will be described below with reference to Fig. 3 and the like. When the instruction signal detected by the key input processing unit 13 is requested to be activated, the control unit 11 of the projector 10 starts the processing described below. Specifically, when the projection operation of the projector 10 is in the stopped state, when the user presses the power button 28a of the key operation unit 28, the display processing of the projection image is started. First, the control unit 11 executes the order of lighting the lamp of the illumination device by operating the lamp driving circuit 17c of the image projecting unit 17, and causes the image processing unit 15 to appropriately operate to project the image so as to correspond to the lighting of the lamp. The portion "projects the image projection (step sn). At this time, the control unit 丨丨 refers to the non-volatile memory 12c of the memory unit 12, and returns the signal processing state to the state before the extinction. Specifically, the input signal is The type, the operation mode, the aspect ratio, and the like are set to the state before the annihilation. The image projection unit 17 starts the image projection via the image processing unit 15 or the like. Then, the control unit 11 serves as the adjustment unit 丨 性 记忆 memory 12e. The front trapezoidal correction amount is read out (step S12). The front trapezoidal correction amount corresponds to the previous trapezoidal correction amount when the projector 1 () is stopped. Further, the control unit (10) is the adjustment unit 11g, and is not the self-memory unit 12 Volatility = (4) e read tolerance (step S13) e. The allowable value is related to the front trapezoid, and when the front trapezoid correction amount is not large, L]::=!r determines the reference value. Corrected in trapezoidal correction In the case of the ±5G class, the allowable value is set to, for example, the level of 30 153456.doc •14-201142463, and the above-mentioned allowable value is written to the non-volatile memory 12c of the memory unit 12, without being required to be j. For example, according to the type of the input signal, the number of valley values can be used separately. Specifically, when the input signal is from the computer, the material value is relatively low, and the input money is from the CD player. In the case of the case, the allowable value is relatively high. This is because the image L from the computer can be projected with high resolution even if it is sacrificed by the sacrificial deformation. The image signal from the CD player is slightly sacrificed. It is also preferable to project the projection with less deformation. In the actual operation, the control unit 11 refers to the non-volatile memory as the adjustment unit W.
Uc中所保管之容許值之表格_面監視輸人信號之種類， =子在複數個容許值之情料，讀出與當前 種類對應之容許值。 就之 步驟Γι2中控制部U作為調整部11§之修正量對比部Ua，將 許值谁戶斤獲得之前梯形修正量與步驟S13中所獲得之容 :仃比較，判斷前梯形修正量是否 於前梯形修正量不超過容許值之情形時(步= 否），認為即便唯捭以此+以 ^ ^S14 · 量之作業變料雜梯料正㈣但修正梯形修正 修正部—用前梯形修正量進行梯形;:，藉由梯形 S15)。另-方面H , 處理(步驟 (步驟S14 :是)，認1 έ形修正量超過容許值之情形時 多餘梯形修正量作食持以别之梯形修正狀態則修正 之作業變得須雜之可能性較高，控制部" 153456.doc •15· 201142463 作為調整部llg之修正限制部llc對圖像處理部15輸出指 不’使梯形修正部15a之梯形修正處理解除或者重設（步驟 S18)。亦即，圖像處理部15之梯形修正被重設而梯形修正 量成為零。 再者，於圖像處理部15之梯形修正量成為零之情形時， 使用者亦可將梯形修正保持原狀，但亦可藉由鍵操作部Μ 之梯形修正按鈕29f、29g之操作而改變梯形修正量使之增 減而將梯形修正修正為適當的級。 然後，控制部11作為調整部llg之切換判定部Ud，判斷 是否存在信號處理之變更（步驟S21)e此處，信號處理之 變更係指輸入信號之切換、動作模式之變更、及縱橫比之 變更。具體而言，藉由使用者操作例如鍵輸入處理部13之 輸入切換按鈕28b，而作為輸入選擇部“之輸入信號之選 擇，於使來自電腦之圖像信號為輸入信號之圖像投射，與 使來自數碼音樂播放H之視訊信號為輸人信號之圖像投射 之間切換輸人信號的情形時，判斷為存在信號處理之變 更。又，藉由使用者操作例如菜單按鈕28c、脫逸按鈕 、三角按㈣3、2915、29。、29(1、讀定按紐296等，而 作為影像投射部17之動作狀態之調節使投射圖像之解像度 增減之情形時’判斷為作為動作模式之變更存在信號處理 變更進而’藉由使用者操作例如菜單按紐28e等，而 作為影像投射部17之動作狀態之調節變更縱橫比之情形 時’判斷為存在信號處理之變更。再者，以上檢測出雙向 &的U處理之變更’但例如亦可判斷為僅於為更高解像 153456.doc 201142463 度較為理想之情形時存在信號處理之變更。具體而+，a 〇 , 虽 將輸入信號自電腦中切換至數碼音樂播放器中時， τ 提向投 射圖像之解像度時’僅於使縱橫比變大時，亦可判斷為存 在信號處理之變更。 於存在信號處理之變更之情形時（步驟S21 :是），和制 部11返回至步驟S12,執行步驟S13、S14、S15、S18之處 理。即，於輸入信號之變更前之前梯形修正量超過容許值 之情形時，圖像處理部15之梯形修正處理停止或者被解 除，於輸入信號之變更前之前梯形修正量不超過容許值之 情形時，藉由圖像處理部15而以前梯形修正量維持梯形修 正處理。 另一方面，於不存在信號處理之變更之情形時（步驟 521 :否）’控制部U作為調整部Ug，藉由使用者操作鍵 輸入處理部13之梯形修正按鈕29f、29g而判斷梯形修正部 15a之梯形修正量是否變化（步驟S22)。於梯形修正量變化 之情形時（步驟S22 :是）’控制部U作為調整部Ug之修正 量保存控制部lle，將變更後之梯形修正量保管於作為記 憶體之RAM 12b中（步驟S23)。 於梯形修正量不變化之情形時（步驟S22 :否）或變更後 之梯形修正量保管於RAM 12b中之後（步驟S23)，控制部H 檢查鍵輸入處理部13之電源按鈕28a之操作，判斷是否自 使用者存在投射結束之指示。於自制者不存在投射結束 之指示之情形時，控制料返回至步驟S2i，執行步驟 522 S24之處理。另一方面’於自使用者存在投射結束之 153456.doc •17· 201142463 指不之情形時，控制部丨丨作為調整部丨lg，將當前之信號 處理狀態保管於記憶部12之非揮發性記憶體12c中並使圖 像處理部15之動作停止，使影像投射部17之燈驅動電路 17c之動作停止而將燈熄滅（步驟S25)。 由以上之說明可明瞭，根據本實施形態之投影機丨〇，於 控制部11之修正量對比部丨la判斷為前梯形修正量超過特 定之容許值之情形時，控制部11之修正限制部1 lc於起動 後或仏號處理之變更後，將梯形修正部之梯形修正量設定 為零，因此可減少用以使梯形修正量適當之操作次數並使 梯形修正之調整作業為有效者以進行極端的梯形修 正之情形為前提’即便於直至下—起動後或信號處理之變 更後為止之期間投影機10之姿勢比較大地變化，亦可使對 應其之梯形修正量之調整作業簡單化。 再者，以上之第1實施形態中，於前梯形修正量超過容 許值之情形時（步驟S14 :是），使圖像處理部15之梯形修 =量為零’但亦可使圖像處理部15之梯形修正量為預先規 定之限制值。如此之限制值係將梯形修正部分性地解除之 目標值。具體而言’於梯形修正量最大能夠設定為±50級 之情形時，限制值設定為例如±10〜20級。 又，以上之第i實施形態中，於起動後與信號處理之變 更後之兩者中’判斷前梯形修正量是否超過容許值，但是 亦可為僅於起動後與信號處理之變更後之任—者中，判斷 前梯形修正量是否超過容許值之處理。 [第2實施形態] 153456.doc -18· 201142463 以下，對第2實施形態之投影機進行說明。再者，第2實 施形態之投影機係將第丨實施形態之投影機變形而成者， 未特別說明之部分係與第丨實施形態之投影機相同者。 若根據圖4、®5，對帛2實_態之投影機之動作進行 說明，則投影機10之控制部i i首先執行將燈點$之順序， 並且經由圖像處理部15而使影像投射部i 7開始圖像之投射 (步驟S111)。其次，控制部11作為調整部llg自記憶部12中 讀出前梯形修正量（步驟S112)，作為調整部Ug自記憶糾 中讀出容許值（步驟S113)。其後，控制利作為調整部 llg，將步驟S112中所獲得之前梯形修正量與步驟8113中 所獲得之容許值進行比較，輯前梯形修正量是否超過容 許值（步驟S114h於前梯形修正量不超過容許值之情形時 (步驟SU4:否），控制部11作為調整部llg使圖像處理部15 之梯形修正部15a以前梯形修正量進行梯形修正處理（步驟 SU5) 〇另一方面，於前梯形修正量超過容許值之情形時 (步驟S114:是），控制部11作為調整部llg判斷圖像處理部 15之梯形修正部15a之當前之梯形修正是否為下側之梯形 f正（步驟S4D。所謂下側之梯形修正，係指於影像投射 部17之液晶面板上形成於螢幕之下側縮小之圖像。 於為下側之梯形修正之情形時（步驟S41r是卜考慮投 影機10之設置狀況特殊，而控制部u作為調整部Ug將圖 像，理部15之梯形修正部15a之梯形修正維持為前梯形修 正量（步驟S115)。即，禁止將梯形修正部…之梯形修正設 定為零或特定之限制值。然後，與第i實施形態之情形時 153456.doc -19- 201142463 相同’控制部11判斷是否存在信號處理之變更（步驟 S121)。於存在信號處理之變更之情形時（步驟S12i :是）， 控制部11返回至步驟S112’執行步驟S113、S114' S115等 之處理。於不存在信號處理之變更之情形時（步驟S121 : 否）’控制部11判斷梯形修正部15 a之梯形修正量是否變化 (步驟S122)。於梯形修正量變化之情形時（步驟si22 : 是），控制部11作為調整部llg之修正量保存控制部Ue將變 更後之梯形修正量保管於RAM 12b中（步驟S123)。另一方 面，於梯形修正量不變化之情形時（步驟S122:否）或變更 後之梯形修正量被保管於RAM 12b中之後（步驟si23)，控 制部11判斷是否自使用者存在投射結束之指示。於自使用 者不存在投射結束之指示之情形時，控制部丨丨返回至步驟 S121，執行步驟8122〜S124之處理。另一方面，於自使用 者存在投射結束之指示之情形時，控制部丨丨作為調整部 llg使圖像處理部15之動作停止，將燈熄滅（步驟S125)e 於步驟S41中並非為下側之梯形修正之情形時，亦即為 上側之梯形修正之情形時，控制部丨丨作為調整部丨“參照 記憶部12讀出圖像資料，經由圖像處理部15等而使影像投 射部17投射確認梯形修正之狀態維持之必要與㈣修正維 持之確認畫面（-種警告畫面）(步驟S43)。使用者利用鍵輸 入處理部13中所設置之鍵操作部28之三角按紐2知、携等 決定修正維持之必要與否。 於使用者決定不維持梯形修正之情形時（步驟S43 : 否）’控制部11作為調整部llg參照記憶部12讀出圖像資 153456.doc -20. 201142463 枓修盈由圖像處理部15等而藉由影像投射部η而投射使梯 开:修正.為零還是為預先規定之限制值之選擇之確認書面 “驟s51)。使用者利用鍵輸入處理部13中所設置之鍵操 相之二角按㈣e、咖等決定修正維持之必要與否。 β者’於使用者決；t維持梯形修正之情形時（步驟⑷： 疋），進入至步驟S115,執行步驟Sl2i〜sm之處理。即， 將梯形修正部15a之梯形修正維持為前梯形修正量。 於使用者決定使梯形修正量為零之情形時（步驟⑽： ⑴）’控制部11作為調整部Ug控制圖像處理部15之梯形修 义P a冑梯形修正部15a之梯形修正處理暫時維持為以 則之梯形修正量即前梯形修正量（步驟s53)。其次，控制 部⑽為調整部llg使梯形修正部⑸之梯形修正量朝向零 而僅以1個階梯以特定之時間減少（步驟S♦控制部U作 為調整部Ug檢查步驟S54中減少之結果之梯形修正量，判 斷減少後之梯形修正量是否達到目標值之零（步驟s55)。 於梯形修正量不達目標值之零之情形時（步驟s55: 否控制部U作為調整部Ug，判斷使用者是否利用鍵輸 入處理部13中所設置之鍵操作部㈣示修正量減少之停止 (步驟S56)’若無修正量減少之停止指示(步驟s56:否）， 則返回至步驟S54使梯形修正部15a之梯形修正量再次朝向 令而減少1個階梯。藉由如此之動作’可使梯形修正量朝 向零而階段性地減少。如以上般，藉由使梯形修正量階段 性地減少，而使用者可視覺上確認梯形修正之變化。 另一方面，於梯形修正量達到目標值之零之情形時（步 I53456.doc 201142463 驟S55 :是）或自使用者存在修正量減少之停止指示之情形 時（步驟S56:是）’控制部返回至步驟，執行步驟 S122〜S125等之處理。 於使用者決定使梯形修正量為特定之限制值之情形時 (步驟S52:⑺），控制仙料調整部Ug控制圖像處理部 15之梯形修正部15a ’將梯形修正部⑸之梯形修正處理暫 時維持為以前之梯形修正量即前梯形修正量（步驟Μ?)。 其次，控制部u作為調整部llg使梯形修正部15a之梯形修 正量朝向限制值而僅以丨個階梯花費特定之時間減少（步驟 S58)。控制部U作為調整部Ug檢查步驟S54中所減少之結 果之梯形修正量，判斷減少後之梯形修正量是否達到限制 值（步驟S59)。該限制值係將梯形修正部分性地解除之目 標值，具體而言，於梯形修正量最大能夠設定為±5〇級之 情形時，且容許值為例如士30級之情形時，限制值被設定 為比容許值更少例如±20級。 於梯形修正量不達目標之限制值之情形時（步驟s59 : 否），控制部11作為調整部Ug判斷使用者是否利用鍵輸入 處理部13中所設置之鍵操作部28指示修正量減少之停止 (步驟S60)，若無修正量減少之停止指示（步驟S6〇 :否）， 則返回至步驟S58而使梯形修正部15a之梯形修正量朝向目 標之限制值再次減少丨個階梯。藉由如此之動作，可使梯 形修正量朝向目標之限制值而階段性地減少。如以上般， 藉由使梯形修正量階段性地減少，而使用者可視覺上確認 梯形修正之變化。 •22· 153456.docThe table of the allowable values stored in Uc _ surface monitors the type of input signal, = the sub-case is in a plurality of allowable values, and reads the allowable value corresponding to the current type. In the step 22, the control unit U serves as the correction amount comparison unit Ua of the adjustment unit 11 §, and compares the amount of the previous trapezoidal correction amount with the volume obtained in step S13: ,, and determines whether the front trapezoidal correction amount is When the front trapezoidal correction amount does not exceed the allowable value (step = no), it is considered that even if the operation variable of the workpiece is positive (4), the correction of the trapezoidal correction correction unit is used. The amount is trapezoidal;:, by trapezoid S15). On-the-side H, processing (step (step S14: YES), when the correction amount exceeds the allowable value, the excess trapezoidal correction amount is used as the food control, and the correction operation becomes complicated. The control unit " 153456.doc • 15· 201142463 is the correction unit 1 of the adjustment unit 11g, and outputs the instruction to the image processing unit 15 to cancel or reset the trapezoidal correction processing of the trapezoidal correction unit 15a (step S18). That is, the trapezoidal correction of the image processing unit 15 is reset and the trapezoidal correction amount is zero. Further, when the trapezoidal correction amount of the image processing unit 15 becomes zero, the user can also hold the trapezoidal correction. However, the trapezoidal correction amount can be increased or decreased by the operation of the trapezoidal correction buttons 29f and 29g of the key operation unit 修正 to correct the trapezoidal correction to an appropriate level. Then, the control unit 11 switches as the adjustment unit 11g. The determination unit Ud determines whether or not there is a change in signal processing (step S21). Here, the change of the signal processing refers to switching of an input signal, change of an operation mode, and change of an aspect ratio. Specifically, by using For example, the input switching button 28b of the key input processing unit 13 is used as the input selection unit to select an input signal for projecting an image signal from the computer as an input signal, and to cause a digital music playback H. When the video signal is a situation in which the input signal is switched between image projections of the input signal, it is determined that there is a change in the signal processing. Further, by the user operation, for example, the menu button 28c, the escape button, the triangle button (4) 3, 2915, When the resolution of the image projection unit 17 is adjusted to increase or decrease the resolution of the projection image, it is determined that the signal processing is changed as the change of the operation mode. When the user operates the menu button 28e or the like, for example, when the aspect ratio is changed as the adjustment of the operation state of the video projecting unit 17, it is determined that there is a change in the signal processing. Further, the U-process of the bidirectional & The change 'but for example, it can be judged that there is a change in signal processing only when it is ideal for a higher resolution 153456.doc 201142463 degree. Specifically + a 〇, Although the input signal is switched from the computer to the digital music player, when τ is raised to the resolution of the projected image, it can be judged that there is a change in signal processing only when the aspect ratio is increased. When the signal processing is changed (step S21: YES), the processing unit 11 returns to step S12, and performs the processing of steps S13, S14, S15, and S18. That is, the trapezoidal correction amount exceeds the allowable value before the input signal is changed. In the case where the trapezoidal correction processing of the image processing unit 15 is stopped or released, and the trapezoidal correction amount does not exceed the allowable value before the change of the input signal, the image processing unit 15 maintains the trapezoidal correction amount by the previous trapezoidal correction amount. Correction processing. On the other hand, when there is no change in the signal processing (step 521: No), the control unit U functions as the adjustment unit Ug, and the user operates the key to the trapezoidal correction buttons 29f and 29g of the key input processing unit 13 to determine the trapezoidal correction. Whether or not the amount of trapezoidal correction of the portion 15a is changed (step S22). When the trapezoidal correction amount is changed (step S22: YES), the control unit U serves as the correction amount storage control unit lle of the adjustment unit Ug, and stores the changed trapezoidal correction amount in the RAM 12b as the memory (step S23). . When the trapezoidal correction amount does not change (step S22: No) or the changed trapezoidal correction amount is stored in the RAM 12b (step S23), the control unit H checks the operation of the power button 28a of the key input processing unit 13, and determines Whether there is an indication that the user has finished projecting. When the owner does not have an indication that the projection is over, the control returns to step S2i, and the processing of steps 522 to S24 is performed. On the other hand, 153456.doc •17· 201142463 when the user has finished projecting, the control unit 丨丨 acts as the adjustment unit 丨lg, and stores the current signal processing state in the non-volatile portion of the memory unit 12. In the memory 12c, the operation of the image processing unit 15 is stopped, the operation of the lamp driving circuit 17c of the image projecting unit 17 is stopped, and the lamp is turned off (step S25). As described above, according to the projector 本 of the present embodiment, when the correction amount comparing unit 丨1a of the control unit 11 determines that the front trapezoidal correction amount exceeds the specific allowable value, the correction unit of the control unit 11 1 lc After the start or after the change of the nicking process, the trapezoidal correction amount of the trapezoidal correction unit is set to zero. Therefore, it is possible to reduce the number of operations for appropriately correcting the trapezoidal correction amount and to make the adjustment operation of the trapezoidal correction effective. In the case of the extreme trapezoidal correction, it is premised that the adjustment operation of the trapezoidal correction amount corresponding thereto can be simplified even if the posture of the projector 10 changes relatively large until after the start-up or after the change of the signal processing. In the first embodiment, when the front trapezoidal correction amount exceeds the allowable value (step S14: YES), the trapezoidal correction amount of the image processing unit 15 is made zero, but image processing can also be performed. The trapezoidal correction amount of the portion 15 is a predetermined limit value. Such a limit value is a target value that partially cancels the trapezoidal correction. Specifically, when the trapezoidal correction amount can be set to a maximum of ±50 steps, the limit value is set to, for example, ±10 to 20 steps. Further, in the above-described first embodiment, it is determined whether the pre-trapezoidal correction amount exceeds the allowable value after both the start-up and the signal processing change, but it may be only after the start-up and after the signal processing is changed. In the case, it is determined whether or not the front trapezoidal correction amount exceeds the allowable value. [Second Embodiment] 153456.doc -18· 201142463 Hereinafter, a projector according to a second embodiment will be described. Further, in the projector of the second embodiment, the projector of the second embodiment is modified, and the parts which are not particularly described are the same as those of the projector of the second embodiment. The operation of the projector in the 帛2 real state will be described with reference to FIGS. 4 and 5, and the control unit ii of the projector 10 first executes the order of the light points $, and projects the image via the image processing unit 15. The part i 7 starts the projection of the image (step S111). Then, the control unit 11 reads the front trapezoidal correction amount from the storage unit 12 as the adjustment unit 11g (step S112), and reads the allowable value from the memory correction as the adjustment unit Ug (step S113). Thereafter, the control unit is used as the adjustment unit 11g, and compares the previous trapezoidal correction amount obtained in step S112 with the allowable value obtained in step 8113, and whether or not the trapezoidal correction amount exceeds the allowable value (step S114h is not the front trapezoidal correction amount). When the allowable value is exceeded (step SU4: NO), the control unit 11 causes the trapezoidal correction unit 15a of the image processing unit 15 to perform the trapezoidal correction processing on the trapezoidal correction amount (step SU5) as the adjustment unit 11g. When the trapezoidal correction amount exceeds the allowable value (step S114: YES), the control unit 11 determines, as the adjustment unit 11g, whether or not the current trapezoidal correction of the trapezoidal correction unit 15a of the image processing unit 15 is the lower trapezoidal f positive (step S4D). The trapezoidal correction on the lower side refers to an image formed on the liquid crystal panel of the image projecting unit 17 and reduced on the lower side of the screen. When the trapezoidal correction is performed on the lower side (step S41r is considered to be the projector 10) The control unit u is used as the adjustment unit Ug to maintain the image and the trapezoidal correction of the trapezoidal correction unit 15a of the control unit 15 as the front trapezoidal correction amount (step S115). The trapezoidal correction of the correction unit is set to zero or a specific limit value. Then, in the case of the ith embodiment, 153456.doc -19- 201142463, the control unit 11 determines whether or not there is a change in signal processing (step S121). When there is a change in signal processing (step S12i: YES), the control unit 11 returns to step S112' to execute the processing of steps S113, S114', S115, etc. When there is no change in signal processing (step S121: No) The control unit 11 determines whether or not the trapezoidal correction amount of the trapezoidal correction unit 15a has changed (step S122). When the trapezoidal correction amount is changed (step si22: YES), the control unit 11 stores the control unit Ue as the correction amount of the adjustment unit 11g. The trapezoidal correction amount after the change is stored in the RAM 12b (step S123). On the other hand, when the trapezoidal correction amount does not change (step S122: No) or the changed trapezoidal correction amount is stored in the RAM 12b. (Step si23), the control unit 11 determines whether or not there is an instruction to end the projection from the user. When there is no instruction to end the projection from the user, the control unit returns to the step. S121, the processing of steps 8122 to S124 is executed. On the other hand, when the user has an instruction to end the projection, the control unit 丨丨 stops the operation of the image processing unit 15 as the adjustment unit 11g, and turns off the light (step S125) When the step S41 is not the trapezoidal correction of the lower side, that is, when the trapezoidal correction is performed on the upper side, the control unit 丨丨 "reviews the image data by referring to the memory unit 12, via the map. The image projection unit 17 causes the image projection unit 17 to project the confirmation of the state of the trapezoidal correction and the confirmation screen (the warning screen) of the correction maintenance (step S43). The user determines whether or not the correction is necessary by using the triangular button 2 of the key operation unit 28 provided in the key input processing unit 13. When the user decides not to maintain the trapezoidal correction (step S43: No), the control unit 11 reads the image 153456.doc as the adjustment unit 11g as the adjustment unit 11g. -20. 201142463 枓修盈 by the image processing unit 15 Then, the image projection unit η is projected to cause the ladder to be opened: the correction is zero or the confirmation of the predetermined limit value is written in the “step s51.” The user inputs the key operation phase set in the processing unit 13 by the key. According to (4) e, coffee, etc., it is necessary to correct the maintenance. If the user is in the user's decision; if the trapezoidal correction is maintained (step (4): 疋), the process proceeds to step S115, and the processing of steps S1i2 to sm is performed. In other words, when the user determines that the trapezoidal correction amount is zero (step (10): (1)), the control unit 11 controls the image processing unit as the adjustment unit Ug. The trapezoidal correction processing of the trapezoidal correction unit 15a of 15 is temporarily maintained as the trapezoidal correction amount, that is, the front trapezoidal correction amount (step s53). Next, the control unit (10) is the adjustment unit 11g to cause the trapezoidal correction unit (5). Trapezoidal correction The direction is zero and only one step is reduced by a specific time (step S♦ The control unit U checks the trapezoidal correction amount as a result of the decrease in step S54 as the adjustment unit Ug, and determines whether the reduced trapezoidal correction amount reaches zero of the target value ( Step s55) When the trapezoidal correction amount is less than zero of the target value (step s55: No control unit U is used as the adjustment unit Ug, and it is determined whether or not the user uses the key operation unit (4) provided in the key input processing unit 13 to correct When the amount of decrease is stopped (step S56)', if there is no stop instruction for the correction amount reduction (step s56: NO), the process returns to step S54, and the trapezoidal correction amount of the trapezoidal correction unit 15a is again reduced by one step toward the command. The action 'can reduce the amount of trapezoidal correction toward zero in stages. As described above, by gradually reducing the amount of trapezoidal correction, the user can visually confirm the change of the trapezoidal correction. On the other hand, the trapezoidal correction When the amount reaches the target value of zero (step I53456.doc 201142463 step S55: Yes) or when the user has a stop indication of the correction amount reduction (step S56: Yes), the control unit returns When the user determines that the trapezoidal correction amount is a specific limit value (step S52: (7)), the control fairy adjustment unit Ug controls the trapezoid of the image processing unit 15 when the user decides to perform the processing of steps S122 to S125. The correction unit 15a' temporarily maintains the trapezoidal correction processing of the trapezoidal correction unit (5) as the previous trapezoidal correction amount, which is the previous trapezoidal correction amount (step Μ?). Next, the control unit u sets the trapezoidal correction amount of the trapezoid correction unit 15a as the adjustment unit 11g. The threshold value is reduced by only one step toward the limit value (step S58). The control unit U checks the trapezoidal correction amount as a result of the reduction in step S54 as the adjustment unit Ug, and determines whether the reduced trapezoidal correction amount reaches the limit value. (Step S59). The limit value is a target value in which the trapezoidal correction is partially released. Specifically, when the trapezoidal correction amount can be set to a maximum of ±5 〇, and the allowable value is, for example, a level of 30, the limit value is Set to be less than the allowable value, for example, ±20 steps. When the trapezoidal correction amount is less than the target limit value (step s59: NO), the control unit 11 determines, as the adjustment unit Ug, whether the user has instructed the key operation unit 28 provided in the key input processing unit 13 to instruct the correction amount to be reduced. When it is stopped (step S60), if there is no stop instruction for the correction amount reduction (step S6: No), the process returns to step S58, and the trapezoidal correction amount of the trapezoidal correction unit 15a is again decreased by one step to the target limit value. By such an action, the amount of the trapezoidal correction can be gradually reduced toward the target limit value. As described above, by gradually reducing the amount of trapezoidal correction, the user can visually confirm the change of the trapezoidal correction. •22· 153456.doc
201142463 另方面，於梯形修正量達到目標之职去丨 (步驟S59:是）或自使 ’、值之情形時 量減少之停 閒形時（步驟S60 ··是），控制邱丨〗.G 々 .疋；控制0卩11返回至步驟S121，執扞 步驟S122〜S125等之處理。 執仃 之 但 判 之第2實施形態中，於起動後與信號處理 a 兩者中，判斷前梯形修正量Μ超過容許值， 疋亦可為僅於起動後與信號處理之變更後之任一者中， 斷前梯形修正量是否超過容許值之處理。 [其他，變形例等] 以上結合實施形態對本發明進行了說明，但是本發明並 不限定於上述實施形態者’可於不脫離其主旨之範圍中於 各種態樣中實施，例如亦可為如以下般之變形。 上述實施形態中，梯形修正量最大能夠設定為±5〇級， 容許值設定為例如±30級，限制值設定為例如±2〇級，但是 该等僅僅為例示’可於任意之設定範圍内適當設定容許值 或限制值。例如，使用者亦可藉由鍵操作部28之菜單按鈕 28c之操作而使設定變更之菜單畫面顯示，並且藉由操作 二角按鈕29a、29b、29c、29d、確定按鈕29e等，而對控 制部11指示容許值或限制值之增減變更，並將非揮發性記 憶體12c之内容覆寫。 又’上述實施形態中’可藉由圖像處理部15之梯形修正 部15 a而進行上側之梯形修正或下側之梯形修正，但是亦 可藉由梯形修正部15a而關於左右進行梯形修正。於該情 形時’不僅上下之梯形修正而且關於左右之梯形修正亦預 153456.doc -23· 201142463 先規定容許值，於起動後或信號處理之變更後，於判斷為 前梯形修正量超過特定之容許值之情形時，可將梯形修正 部15a之梯形修正量設定為零。 上述第2實施形態中，於步驟S53〜S56、S57〜S60中，一 面使梯形修正量每〗個階梯地變化一面設定為目的之量， 本發明並非限定於如此之動作者，使用者亦可藉由鍵操作 而直接設定為目的之梯形修正量。於該情形時，可將梯形 修正量之設定迅速變更為希望之值。 無需將鍵操作部28設置於本體10a中，亦可將鍵操作部 28僅設置於遙控26中。 【圖式簡單說明】 圖1(A)係表示第丨實施形態之投影機之構造之方塊圆， (B)及（C)係對圖像之梯形修正進行說明之圖。 圖2係例示構成鍵操作部之鍵要素之圖。 圖3係對第1實施形態之投影機所 啊W進仃之處理之流程進 說明的圖。 進行之處理之流程進行 圖4係對第2實施形態之投影機所 說明的圖。 圖5係對第2實施形態之投影 說明的圖。 機所進行之處理之流程進行 【主要元件符號說明】 10 投影機 10a 本體 11 控制部 153456.doc •24- 201142463 lla 修正量對比部 lib 修正維持部 11c 修正限制部 lid 切換判定部 lie 修正量保存控制部 Hg 調整部 12 記憶部 12a ROM 12b RAM 12c 非揮發性記憶體 13 鍵輸入處理部 14 輸入選擇部 15 圖像處理部 15a 梯形修正部 17 影像投射部 17a 液晶面板驅動部 17c 燈驅動電路 18 通訊部 22 電源部 25 遙控受光部 26 遙控 28 鍵操作部 28a 電源按紐 28b 輸入切換按紅 153456.doc • 25- 201142463 28c 菜單按Ifi 28d 脫逸按紐 29a、29b、29c、29d 三角按鈕 29e 確定按紐 29f、29g 梯形修正按鈕 29h 變焦按紐 41 連接器 153456.doc -26-201142463 On the other hand, when the trapezoidal correction amount reaches the target position (step S59: Yes) or when the value of the value is reduced, the amount of time is reduced (step S60 · · Yes), control Qiu Yi〗.G控制.疋; Control 0卩11 returns to step S121, and the processes of steps S122 to S125 and the like are executed. However, in the second embodiment, in the second embodiment, after the start-up and the signal processing a, it is determined that the front trapezoidal correction amount Μ exceeds the allowable value, and 疋 may be any one after the start-up and the signal processing change. Among them, whether or not the trapezoidal correction amount before the break exceeds the allowable value. [Others, Modifications, etc.] The present invention has been described above with reference to the embodiments. However, the present invention is not limited to the embodiments described above, and may be implemented in various aspects without departing from the spirit and scope of the invention. The following variations. In the above embodiment, the trapezoidal correction amount can be set to a maximum of ±5 〇, the allowable value is set to, for example, ±30, and the limit value is set to, for example, ±2 ,, but these are merely exemplified as being arbitrarily set within a range. Set the allowable value or limit value as appropriate. For example, the user can display the menu screen of the setting change by the operation of the menu button 28c of the key operation unit 28, and control the operation by operating the two-corner buttons 29a, 29b, 29c, 29d, the determination button 29e, and the like. The portion 11 indicates the change of the allowable value or the limit value, and overwrites the contents of the non-volatile memory 12c. Further, in the above-described embodiment, the upper side trapezoidal correction or the lower side trapezoidal correction can be performed by the trapezoidal correction unit 15a of the image processing unit 15, but the trapezoidal correction unit 15a can perform the trapezoidal correction on the right and left. In this case, 'not only the upper and lower trapezoidal corrections but also the left and right trapezoidal corrections are pre-defined 153456.doc -23· 201142463. The allowable value is specified first. After the start or after the signal processing is changed, it is determined that the front trapezoidal correction amount exceeds the specific value. In the case of the allowable value, the trapezoidal correction amount of the trapezoidal correction unit 15a can be set to zero. In the second embodiment, in the steps S53 to S56 and S57 to S60, the trapezoidal correction amount is set to the target amount every stepwise change, and the present invention is not limited to such an actor, and the user can also The trapezoidal correction amount for the purpose is directly set by the key operation. In this case, the setting of the trapezoidal correction amount can be quickly changed to the desired value. It is not necessary to provide the key operating portion 28 in the main body 10a, and the key operating portion 28 may be provided only in the remote control 26. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1(A) is a block diagram showing the structure of a projector according to a third embodiment, and (B) and (C) are diagrams for explaining trapezoidal correction of an image. Fig. 2 is a view showing a key element constituting a key operation unit. Fig. 3 is a view for explaining the flow of processing of the projector of the first embodiment. Flowchart of the process performed Fig. 4 is a view for explaining the projector of the second embodiment. Fig. 5 is a view showing projection of the second embodiment. Flow of processing performed by the machine [Description of main component symbols] 10 Projector 10a Main body 11 Control unit 153456.doc •24- 201142463 lla Correction amount comparison unit lib Correction control unit 11c Correction control unit lid Change determination unit lie Correction amount storage Control unit Hg adjustment unit 12 Memory unit 12a ROM 12b RAM 12c Non-volatile memory 13 Key input processing unit 14 Input selection unit 15 Image processing unit 15a Trapezoidal correction unit 17 Video projection unit 17a Liquid crystal panel drive unit 17c Lamp drive circuit 18 Communication unit 22 Power supply unit 25 Remote control light receiving unit 26 Remote control 28 Key operation unit 28a Power button 28b Input switch Press red 153456.doc • 25- 201142463 28c Menu press Ifi 28d Release button 29a, 29b, 29c, 29d Triangle button 29e OK button 29f, 29g Keystone correction button 29h Zoom button 41 Connector 153456.doc -26-